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Nitrogen (II) oxide and nitrogen (IV) oxide are some of the gases released from car exhaust pipes. State how these gases affect the environment.
Date posted:
February 6, 2017
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a) Give reason why concentrated sulphuric (VI) acid is not used to dry ammonia gas
b) Name one suitable drying agent for ammonia gas
Date posted:
February 6, 2017
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Concentrated nitric (V) acid was added to Iron (II) sulpahate acidified with dilute sulphuric (VI) acid the mixture heated. The solution turned from pale green to yellow with evolution of brown gas. Explain these observations.
Date posted:
February 6, 2017
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Describe how nitrogen gas is obtained from the liquid air.
Date posted:
February 6, 2017
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a)Give reason why concentrated sulphuric (VI) acid is not used to dry ammonia gas
b) Name one suitable drying agent for ammonia gas
Date posted:
February 3, 2017
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State and explain the observations that would be made if a sample of sulphur is heated with concentrated nitric (V) acid.
Date posted:
February 3, 2017
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Why is it advisable to obtain nitrogen from air instead of from ammonia.
Date posted:
February 3, 2017
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Ethane gas was reacted with 1 mole of bromine gas. State one observation made during this reaction.
Date posted:
February 3, 2017
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State one source of alkanes.
Date posted:
February 3, 2017
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State one use of polystyrene.
Date posted:
February 3, 2017
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A group of compounds called chlorofluorocarbons have a wide range of uses but they also have harmful effects on the environment. State one
a) use of chlorofluorocarbons
b) Harmful effect of chlorofluorocarbons on the environment
Date posted:
February 3, 2017
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Name two isomers of butene.
Date posted:
February 3, 2017
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What is meant by isomerism?
Date posted:
February 3, 2017
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One of the reactions undergone by ethene is addition polymerisation.
Give the name of the polymer and one disadvantage of the polymer it forms.
Date posted:
February 3, 2017
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What is the name given to the smallest repeating unit of a polymer?
Date posted:
February 3, 2017
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State one industrial use of hydrogenation.
Date posted:
February 3, 2017
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One of the fuels associated with crude oil is natural gas. Name the main constituent of natural gas and write an equation for its complete combustion.
Date posted:
February 3, 2017
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Give two use of bitumen
Date posted:
February 3, 2017
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What condition could cause a poisonous gas to be formed when kerosene is burnt? Explain
Date posted:
February 3, 2017
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Describe how solid sample of potassium sulphate can be prepared starting with 200 cm3 of 2M potassium hydroxide.
Date posted:
February 3, 2017
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Start the Gay Lussac’s Law.
Date posted:
February 3, 2017
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Starting with 50 cm 3 of 2.8 M sodium hydroxide, describe how a sample of pure sodium sulphate crystals can be prepared.
Date posted:
February 3, 2017
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State why it is not advisable to wash vehicles using sea water.
Date posted:
February 3, 2017
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State the Boyle's law.
Date posted:
February 3, 2017
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State the Graham’s law of diffusion.
Date posted:
February 3, 2017
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A small crystal of potassium manganate (VII) was placed in a beaker containing water. The beaker was left standing for two days without shaking. State and explain the observation that were made
Date posted:
February 3, 2017
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State the Charles’ law.
Date posted:
February 3, 2017
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A few crystals of crystals of potassium manganite (VII) were carefully placed into water in a beaker at one spot. The beaker was left undisturbed for two hours. State and explain the observations.
Date posted:
February 3, 2017
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In an experiment, ammonium chloride was heated in a test-tube. A moist red litmus paper placed at the mouth of the test tube first changed blue then red. Explain these observations
Date posted:
February 3, 2017
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Charcoal is a fuel that is commonly used for cooking. When it burns it forms two oxides
a) Name the two oxides
b) State one use of the two oxide
Date posted:
February 3, 2017